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Title: Subducted seafloor relief stops rupture in South American great earthquakes: implications for rupture behaviour in the 2010 Maule, Chile earthquake
Authors: Sparkes, Robert
Tilmann, Frederik
Hovius, Niels
Hillier, John K.
Keywords: Great earthquakes
South America
Issue Date: 2010
Publisher: © Elsevier B.V.
Citation: SPARKES, R. ... et al., 2010. Subducted seafloor relief stops rupture in South American great earthquakes: implications for rupture behaviour in the 2010 Maule, Chile earthquake. Earth and Planetary Science Letters, 298 (1-2), pp. 89 - 94.
Abstract: Great subduction earthquakes cause destructive surface deformation and ground shaking over hundreds of kilometres. Their rupture length is limited by the characteristic strength of the subduction plate interface, and by lateral variations in its mechanical properties. It has been proposed that subduction of topographic features such as ridges and seamounts can affect these properties and stop rupture propagation, but the required relief and physical mechanisms of topographic rupture limitation are not well understood. Here, we show that the rupture limits of thirteen historic great earthquakes along the South America–Nazca plate margin are strongly correlated with subducted topography with relief > 1000 m, including the Juan Fernandez Ridge. The northern limit of rupture in the Mw 8.8 Maule, Chile earthquake of 27 February 2010 is located where this ridge subducts. Analysis of intermediate-magnitude earthquakes shows that in most places, the subduction of high seafloor relief creates weak, aseismic zones at the plate interface, which prevent rupture propagation, but that the Juan Fernandez Ridge is associated with a locally strong plate interface. The maximum rupture length, and thus magnitude, of great subduction earthquakes is therefore determined by the size and lateral spacing of topographic features where they are present on the subducting plate.
Description: This article was published in the journal, Earth and Planetary Science Letters [© Elsevier B.V.] and the definitive version is available at: http://dx.doi.org/10.1016/j.epsl.2010.07.029
Version: Accepted for publication
DOI: 10.1016/j.epsl.2010.07.029
URI: https://dspace.lboro.ac.uk/2134/13012
Publisher Link: http://dx.doi.org/10.1016/j.epsl.2010.07.029
ISSN: 0012-821X
Appears in Collections:Published Articles (Geography and Environment)

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